注射
发表于 2025-3-21 19:28:46
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随意
发表于 2025-3-22 00:12:28
LAN: Ethernet, token ring and FDDI,. Normally, LANs are owned and operated by their user. Standards for LAN have been agreed through the IEEE 802 and ANSI X3T9.5 committees. The IEEE standards have now been adopted by the ISO as international standards.
engrave
发表于 2025-3-22 01:41:23
LAN performance,ty with other equipment, long term availability of hardware and software, and its general reliability. A major concern is the behaviour of the network under heavy loads. The IEEE 802 committee sponsored Bell Labs to analyze the performance of token ring and CSMA/CD networks. Their general conclusion
CT-angiography
发表于 2025-3-22 05:13:55
Transmission Control Protocol (TCP) and Internet Protocol (IP),protocols which allow one subnet to communicate with another. A protocol is a set of rules which allow the orderly exchange of information. The IP part corresponds to the Network layer of the OSI model and the TCP part to the Transport layer. Their operation is transparent to the Physical and Data L
释放
发表于 2025-3-22 12:43:16
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monopoly
发表于 2025-3-22 16:41:39
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omnibus
发表于 2025-3-22 20:04:41
Pulse coded modulation (PCM),At the receiver the digital code converts back into an analogue form. Digital signals are generally less affected by noise and thus provide a more reliable method of transmitting data. Figure 10.1 shows an example digital signal with noise added to it. The comparator outputs a HIGH level (a ‘1’) if
MUTED
发表于 2025-3-22 23:06:46
Integrated Services Digital Network (ISDN),ssion to digital exchanges using PCM switching and transmission. The interface to many telephones is still analogue, as shown in Figure 11.1(a). Over the coming years this will change so that the speech is converted to digital data within the consumer’s equipment, as illustrated in Figure 11.1(b). T
树木心
发表于 2025-3-23 02:08:33
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MOT
发表于 2025-3-23 07:58:53
X-Windows,n easy-to-use way. In a text-based system the user enters text commands which are then interpreted by the operating system. Typical commands are to run application programs, copy files and so on. With a graphical interface, applications programs are represented by graphical objects (icons) and optio